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Home energy guides

Plain-English answers to the questions homeowners ask about solar, batteries, heating and electricity bills. Every guide shows the numbers and links to a calculator so you can run your own.
Solar

How Many Solar Panels Do I Need to Power a House?

Short answer: the average US home, using about 865 kWh a month, needs around 20 solar panels of 400 W (an 8 kW system) where there are 4.5 peak sun hours a day. In a clou...

Oct 22, 2026 3 min read 0 comments
Solar

How Many kWh Does a Solar Panel Produce Per Day?

Short answer: a typical 400 W solar panel produces about 1.4 kWh a day with 4.5 peak sun hours, or about 525 kWh a year. In a cloudier climate with 3 sun hours, it makes...

Oct 22, 2026 3 min read 0 comments